Acrylamide gels sitcks to plates

I want to make an 8% acrylamide, 8M urea, 1x TBE sequencing gel.
Runs and pours well but sticks to glass plates and won't transfer to even
the best quality filter paper! This is despite siliconizing the opposite
plate and I even tried mildly siliconizing the "gel plate".
When I went down to 6% acrylamide, 6M urea, I got slight improvement but
still sticks and gel was trashed!
I never seemed to have had this problm before using LongRanger (Hydrolink)
acrylamide mix and 0.6X TBE (Nice but quite expensive).
Does someone have an idea what I am doing wrong?
How do I deal with this acrylamonster?